productboard - Beautiful and powerful product management.
Userfeed - Product feedback made for Intercom
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.
Fider - Fider is an open source, cross platform and free to use customer feedback platform for companies...
ProductPlan - Cloud-based product roadmap software solution
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.